AA 9950 then UA 455 at O'Hare
Philadelphia → Chicago → Phoenix
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
12:55UA 455 to Phoenix leaves the gate
23 h 06 apart on the timetable, overnight
UA 455 leaves 23 h 06 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.